EP 3825438 A4 20220316 - METHOD FOR PRODUCING SURFACE-HARDENED MATERIAL
Title (en)
METHOD FOR PRODUCING SURFACE-HARDENED MATERIAL
Title (de)
VERFAHREN ZUR HERSTELLUNG VON OBERFLÄCHENGEHÄRTETEM MATERIAL
Title (fr)
PROCÉDÉ POUR LA PRODUCTION DE MATÉRIAU DURCI EN SURFACE
Publication
Application
Priority
- JP 2018163627 A 20180831
- JP 2019032980 W 20190823
Abstract (en)
[origin: EP3825438A1] A method for producing a surface-hardened material, comprising: an immersion step of immersing an iron steel material having nitrogen attached in the form of a solid solution on the surface thereof in a melt containing a chloride at a temperature ranging from 650°C to 900°C; and a cooling step of cooling the immersed iron steel material to a temperature equal to or lower than a martensitic transformation start temperature at a cooling rate equal to or higher than a lower critical cooling rare at which martensitic transformation starts.
IPC 8 full level
C21D 1/06 (2006.01); C21D 1/18 (2006.01); C21D 1/26 (2006.01); C21D 1/32 (2006.01); C21D 1/46 (2006.01); C21D 1/58 (2006.01); C21D 1/60 (2006.01); C21D 1/76 (2006.01); C22C 38/60 (2006.01); C23C 8/02 (2006.01); C23C 8/22 (2006.01); C23C 8/26 (2006.01); C23C 8/28 (2006.01); C23C 8/34 (2006.01); C23C 8/38 (2006.01); C23C 8/46 (2006.01); C23C 8/50 (2006.01); C23C 8/66 (2006.01); C23C 8/80 (2006.01); C23C 12/02 (2006.01)
CPC (source: EP US)
C21D 1/06 (2013.01 - EP US); C21D 1/18 (2013.01 - EP); C21D 1/26 (2013.01 - EP); C21D 1/32 (2013.01 - EP); C21D 1/46 (2013.01 - EP); C21D 1/58 (2013.01 - EP); C21D 1/60 (2013.01 - EP); C21D 1/76 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C23C 8/02 (2013.01 - EP); C23C 8/22 (2013.01 - EP); C23C 8/26 (2013.01 - EP); C23C 8/28 (2013.01 - EP); C23C 8/34 (2013.01 - EP); C23C 8/38 (2013.01 - EP); C23C 8/46 (2013.01 - EP US); C23C 8/50 (2013.01 - EP US); C23C 8/66 (2013.01 - EP); C23C 8/80 (2013.01 - EP); C23C 12/02 (2013.01 - EP); C21D 2211/008 (2013.01 - EP)
Citation (search report)
- [XY] RU 2003732 C1 19931130 - SHELAGUROV MIKHAIL ALEKSANDROV [RU]
- [XYI] JP 2012031480 A 20120216 - DAITO KOGYO CO LTD
- [XYI] GB 1185640 A 19700325 - ICI LTD [GB]
- [XYI] EP 0264448 A1 19880427 - TOYODA CHUO KENKYUSHO KK [JP]
- See references of WO 2020045266A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3825438 A1 20210526; EP 3825438 A4 20220316; CN 112469842 A 20210309; JP 2020033634 A 20200305; JP 7178832 B2 20221128; MX 2021001758 A 20210419; US 11332818 B2 20220517; US 2021214833 A1 20210715; WO 2020045266 A1 20200305
DOCDB simple family (application)
EP 19853464 A 20190823; CN 201980040442 A 20190823; JP 2018163627 A 20180831; JP 2019032980 W 20190823; MX 2021001758 A 20190823; US 201917270960 A 20190823